IPA: /ˌæntɪˈkwɛəriən/
KK: /æn'tɪkwɛriən/
Relating to the study or collection of old or rare items, especially books and artifacts.
The antiquarian bookstore was filled with rare first editions and historical manuscripts.
Comparative: more antiquarian
Superlative: most antiquarian
A person who studies, collects, or sells old and valuable items, especially from the past.
The antiquarian displayed his rare collection of ancient coins at the museum.
Antiquarian → It is formed from "antiquus" (meaning ancient) and "-arian" (meaning one who practices or is concerned with). The word refers to someone who is concerned with or studies ancient things, particularly artifacts or books.
Think of someone who is focused on the 'ancient' ('antiquus') — that's why an antiquarian is someone who studies or collects ancient items.